Characterization and removal of dissolved organic matter (DOM) from landfill leachate rejected by nanofiltration.
Dissolved organic matter (DOM) from wastewater rejected by nanofiltration from a landfill leachate treatment plant was fractionated into humic acid (HA), fulvic acid (FA) and hydrophilic (HyI) fractions. It was found that humic substances (HA and FA) composed 75% of the total dissolved organic carbon (DOC) concentration of the DOM, with an average molecular weight of about 1000 Da. Elemental analysis, infrared spectroscopy, UV-visible spectroscopy and acid-base titration observations showed that the HA and FA of the DOM exhibited lower fractions of condensed aromatic functional groups but larger fractions of acidic groups compared with other aquatic DOMs. The properties of HA and FA were similar, but HA exhibited more complete humification, while the HyI fraction had more acidic groups. An aminated polymeric adsorbent NDA-8 was used to adsorb the DOM in the wastewater along with primary coagulation. Results of bench-scale experiments indicated that the treatment process could effectively remove the DOM and heavy metals while desorption liquid was 10 times more condensed than raw wastewater. Results of desorption and reproducibility tests consolidated the strong application potential of this treatment process as an advanced landfill leachate treatment technology.
Zhang
Long
L
State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Hankou Road, Nanjing University, Nanjing 210093, China.
Li
Aimin
A
Lu
Yufei
Y
Yan
Lei
L
Zhong
Sheng
S
Deng
Conglin
C
D000327:Adsorption; D001578:Benzopyrans / Q000737:chemistry / Q000302:isolation & purification; D002244:Carbon / Q000302:isolation & purification; D006812:Humic Substances; D019216:Metals, Heavy / Q000737:chemistry / Q000302:isolation & purification; D008970:Molecular Weight; D036103:Nanotechnology; D009930:Organic Chemicals / Q000737:chemistry / Q000302:isolation & purification*; D012037:Refuse Disposal / Q000295:instrumentation / Q000379:methods*; D012995:Solubility; D013056:Spectrophotometry, Ultraviolet; D017550:Spectroscopy, Fourier Transform Infrared; D017186:Titrimetry; D014462:Ultrafiltration / Q000295:instrumentation / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000302:isolation & purification*
D001578:Benzopyrans; D006812:Humic Substances; D019216:Metals, Heavy; D009930:Organic Chemicals; D014874:Water Pollutants, Chemical; D002244:Carbon; C005023:fulvic acid